This issue appears with clutter AC. Run http://www.webkit.org/blog-files/3d-transforms/poster-circle.html and then resize a window.
Created attachment 199405 [details] Patch
http://cgit.collabora.com/git/webkit-clutter.git/commit/?h=wip/changseok/unreviewed&id=1b291725d655029676356f2e575d3cb09bc90d11 for webkit-clutter
Comment on attachment 199405 [details] Patch Attachment 199405 [details] did not pass mac-wk2-ews (mac-wk2): Output: http://webkit-queues.appspot.com/results/44852 New failing tests: fast/repaint/japanese-rl-selection-repaint-in-regions.html
Created attachment 199452 [details] Archive of layout-test-results from webkit-ews-14 for mac-mountainlion-wk2 The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews. Bot: webkit-ews-14 Port: mac-mountainlion-wk2 Platform: Mac OS X 10.8.2
Comment on attachment 199405 [details] Patch Clearing flags on attachment: 199405 Committed r149039: <http://trac.webkit.org/changeset/149039>
All reviewed patches have been landed. Closing bug.